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Summary of Capital Expenditures Including Accrued Amounts (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Total capital expenditures | $ 66,252 | $ 21,206
Safety |  |
Segment Reporting Information [Line Items] |  |
Total capital expenditures | 11,470 | 12,242
Community |  |
Segment Reporting Information [Line Items] |  |
Total capital expenditures | 7,147 | 5,440
Properties |  |
Segment Reporting Information [Line Items] |  |
Total capital expenditures | 40,994 | 3,094
Corporate and Other |  |
Segment Reporting Information [Line Items] |  |
Total capital expenditures | $ 6,641 | $ 430

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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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